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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e627da7f47f48126485ad27b19d4525c0db250335b179e487ab11bda170a56f' 
  AND token = 'FAFrElJnG5w90r4Gr4ve1TE34+BKcrwsOkvdlrP4zo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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