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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3d285e01215e261a07a0b5c411c72cf823519861f849ab8024b8cd14cb1245' 
  AND token = '2s5EaW70++jQndXV/Ny/vI+TskDB2pX1LicAO/JGPP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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