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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b949b58f0214113a5e3157a56bf860d14ecd1aeba159d297601e6e53bd73ebc4' 
  AND token = 'RPNIvy6bmQKox9pibOVqbvnFA6Lq2cCrhUmf32qiv4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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