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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b46658760617df8bcf31ce6e72d6c9e8be2e617e3986e7a1b6117a7167a40a' 
  AND token = 'J2bqMAW730nnrcEH2/vhmN2ILecbU6m75NaLrkFXnoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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