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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90f70d2d491461fa2df74cc84126867a2b03e7fa7ae80cd5567858e26f058f4' 
  AND token = 'vh/nXZy4ocfMVao665TIFv6mAjtRsumLa7C9FPNWdNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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