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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c49496a2537966101fd959f52e99292c1a1de26220bd77b13aec4c2f6cf6eca' 
  AND token = '8X850UBwSvnAbhOIX17JYRRYgSUwYIazbNgJItvaKJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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