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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c1ec471d5727aec27f158c00c783e625c679dae245164ae1d693e38c781e40' 
  AND token = 'J1tu92v+azvxI0hteSWoCJbeWg3TypxCQIbZyIjMwWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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