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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7f11efe0e7844a48744d7f44fdbefa213e7fb28e6f1fc30772dd74142a3b57' 
  AND token = 'NTmHpa/heXCCqbWpGPr92F97LHzuG+oefI1avj7JwDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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