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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0e3fadf5db3bd887c081e30c9c6685925ec1d6fb0bee6ffadc4f9602abca54' 
  AND token = 'TLcWp6wTSndOSo80c1SWA+c2fHczKZrY39muVBA1RPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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