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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7048a41cb45b59f5df4e195847e588cf7b32029337c1137f358d54249feebfc' 
  AND token = 'TT3QF86y1o6PKdlDHoFOeVsXE8JlQdB8uJ8bi9v/1Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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