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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20a327c4f4dd1f1d6abd4bc4b501eb024cead5b0a38dee3e2b99fda93367160' 
  AND token = 'dxhUobQUY+4zNaggibKjLXGewGtl9Y7iN/T+qDqqkG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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