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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c066175367bb01502e7cd63ae91cbc872b883584e6859579522a965a9c3de7' 
  AND token = '0Qdgi9/X3lR1NoJq1aUa3P/Op00AOF92nx/Q9nnAsQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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