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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432f414b20ba3071f0e3a99790d57403c8a37a63727dac010b50fad8bd5dc93c' 
  AND token = 'WvSYTFjKMIG0GmpL7UVD4PYLNn456kVI2lIujVFzyBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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