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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afa8d4bf96c3a76dc49ab53d3bbb8ba294d5cf6b49bb5c6229b9350a77f2134' 
  AND token = 'LJXPw6h8OIDC6OgyNXfuy2SVD7JemQ1WbMig5E/Vrzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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