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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ca76af9477a7ceeab78803fd3354fe12a3a6b2be8a533d0682d5649dc01d34' 
  AND token = '4VD0qtRKdPTdOwSB4q2HUoDHsgBeiODcqj2YGR5ZSKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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