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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd9170d18c3213117445b32a5f7cb8c07e8dc56c5be2a1e71768a93ee672dba' 
  AND token = 'lUHG04XNRg9p8AeyOcWB/t7PAhgNobQaQ+GHbbG68S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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