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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b14b8b51a8788af426ff1ed66933520d4b4ae52aa6bf47f243c0cc9b21de01' 
  AND token = 'LdDLEjtGQigX59GzO4uqrqwm4Uje+34F4edWeMgjl2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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