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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d615616b7dec3a29b26267e0aaa0b5a0816ffe9d60f75c8c3d7b55f4d079bf' 
  AND token = '7D1STMR4fqv1Ql3M4wTO+Ly2qTJVhIjAybsY6ijjLSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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