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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bea9aee4f1d8904561dd03da7fa25dda037640d1643d0b9925970dd283110b' 
  AND token = 'HsZ9y4+j9rynayhytBaASWE+0LOBvgN7eryvu1myfS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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