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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d62de97607cccc61d04d3117f945cf4c78657a3e1b478c05ec46e48659596d' 
  AND token = 'idzfQ+nnFPBFEu4KmXp2N1JL2dWlCYzvtAMfjc5key0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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