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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d97bc3d9e57ae89c53122b571fa651686efe02c4c21f2f3e45ca2403b56a3a' 
  AND token = 'fap2fibFGDAhapDa9Hu0stpP00Y09i+yIosMWA3i4TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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