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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95dcb148200a11e873dfd7468712143c39d7af50e85d8da9badb6b69336b8b78' 
  AND token = 'vPBCDeJn5TZau1MCW+Chi3rOd4NuaNPACKnmSODNd7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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