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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5b57758cba9bbe3345d2c517804f1f368685ae7dbaa1bf187d3414be885a2b' 
  AND token = '5+rtdkyfvDVKSzrl/R9ooo5xUlIAj9977DM0ArIck7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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