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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a52bf5dd488c017526d0eec0cd27bf3c5b9b27e2ad330fc1a975423bc52c7b' 
  AND token = 'LpBeKpAHdDDZIVbadB/wyOo4pLgkhciYWggbrwRBbl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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