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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2882d364dc16dc3e4f9c2f5e2eccf91bc3d96236a12b99ed323a7c3c71fbe0' 
  AND token = 'JKCZAOqKr21HlQdp2aiy7G0Onf7jan2DIBcH2QRhwRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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