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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07afa905a5f5a55122e3b081e3fccaa6fc86b51759e71fc5db5125bf37066b2' 
  AND token = 'VJJRTC09t7hmvmK1iiJ8+vfhXk/r1UHDyCge7bKJ1Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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