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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c723cdf6156ee2a30bcc040f06d4bfd2840b6b94f1a41b2637724fd6c3d448' 
  AND token = 'R2gFdFnElYY3r7i7dL+8Yoa1OV8GipAA/d5ltlZNhhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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