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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b40ce0577d89430ccc153b80a9fbdf86035a0824b6708a40d9ee509aa1fdefb' 
  AND token = 'R7cNRp1Y80NwnsGKLnEoA3SWHLokx6a23x1shtb5rM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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