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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3f59e8622780d86f33927b28a117a69db6aa4d6f936a2e51d452b61d6006d7' 
  AND token = 'F7++amrpuK3N41pGiEwpdKeJB0sU7qLv3PMT27Q5DRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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