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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62650068d5a9bb951923809525ba0559d24193dd3211d3174e8deb9891191e56' 
  AND token = 'mVWvrLC1jsPCYxGcAIAvtPlle++7s/9+g/VCGBRPLzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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