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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635f36801314be42b519e485dd87d60c4e85570b6a6418f279495689c1e354e4' 
  AND token = 'NZ1TPDauap2gMHzWTJJe4dgoaDbiDnAh2kuKwLfSMVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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