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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b697612a00a4069e50e12bab0c681267b27dfdbdda0ef1e2cd13916a14ce60dd' 
  AND token = 'KN4IBfSopPOn52nPZ8NcM8pfWVeptzjAh2oEw8vcSeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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