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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911fae413bf30f461d0b546c145f638186359acbf3758d32057f0a54fe2fc785' 
  AND token = '08dXah7IOXMnwrpiwqI/mknstw+x5bSKyafMJWsAgIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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