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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b6c5641c1028aa00563da6faadc001052bc8f2e36f2efde2f128c250e85ee4' 
  AND token = 'aEGb03Z7DiVcXQHM8btNyxcyYZBcVDb4LTfAA1mFx64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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