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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2b09bc80d2aa9b7c99d3cb7f01b55881f537608022d035af2cdeca9691e5f0' 
  AND token = 'z9Ai5ryTfllS9N18O5Cs2LlHiDXNwTR+odqoneSrek4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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