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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b685573cdc2d9e709af53ceb00d0fbc0c60687c22b97a62abb82d7d270e072e' 
  AND token = '74DJ+x9P4ymU2zVA3YrZjlw13sm2lm7WTXUfK9pPqJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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