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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852e906f317ad88e7028e53f4e8a6e19342ddf60ce9d8bf7fff34de7ae6b3e6e' 
  AND token = 'Vwi/p2G3NdSO7Y7VZyaLU0lovq3/YZf6WwISfgmCzcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}