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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86955443a7c950a7ae4577394adab38fe76281269492ed30592d7435feb249c9' 
  AND token = 'Yfh5i0D0zTFKWwPWKurc5CXvFIt9iajpeHIQcOMN2cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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