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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c3edf9829dc44c07adf2fae3274606caeefa6f701197f5c552370025d959aa' 
  AND token = 'Bvf32eybjFw9AvAkwtx/8l2aIIcL8XSmHMg8EOXntPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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