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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf3783aa0bea9fa4315eaffa8af9e27e5e7706bb61bc31afa1d9a16826e77ce' 
  AND token = 'b42GgqtCI+07oH8cy5KbuWEYy6orofMvoPDMhuS3P7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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