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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f617a2236073571b4b8b0d21e3c6d73cb89107ba0082d0052fb815cc2f1c6ba' 
  AND token = 'k2eVXXcggrt316bd+Y1OERHg8xfoDXXF1razNWBw9pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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