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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9198f522ff9fd4e3efccec4f1684c5d0414eaea37607ca3c0465a749e37f0b' 
  AND token = 'pdlWOL81rbtp04TVV6wjOtzRroYY5H2PBie+z//3mLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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