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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deff4a20b3a5204498ff1fe43029d559feee1a841e822f6dd70c4ff19d701dbd' 
  AND token = 'Eif/9w465q5vHBRbpLNxYpseViwbNDyc4eMYop2e+9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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