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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d085773af49112fcf6af1cf06a931320048577d353f069120fa32f2c7dadda' 
  AND token = 'KnnMRn7d4VFtSpzGDNIedm6tgeh4dG+Melgn4dB4PkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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