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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49336c124d62e471eb191bb03cba811914e46f0323f8c1a053a96c47931e580' 
  AND token = 'AGKVf7GReDYeP9dxEZnyN5R41i2iefV8e9n1DV9w5CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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