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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38208111083ae49b4c7596a067c2b6e0095e02bdc09605d0a8e841f5f65658c' 
  AND token = 'rr7QEeh64q0KGoB69CiJXJLMrJLzrunO2ZnghPMHjos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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