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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1d5a0b8b3e472c926d3338889df47cda4f82a0de0a9dc47164f150693ad52e' 
  AND token = 'EuSqoc59N0PP92DBf+co1FSLHzBMySNuk+KZVsHDOu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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