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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da2c4baf1099ff776f73d6ad9693063dce18327e10234e51840f38ffc9e0a74' 
  AND token = 'EXIsu3vNpHuNy91CaHvt8fzdzJ98i9+8vF3ajyiSEoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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