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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0d3a7b21041d7bec82f01dc92cf2fccd5fa343720aaf51a7d5d2c485a1e546' 
  AND token = '2mLRsKyCoSzH4qarAIyM7TT1kdtMETCji9qtBYXpD6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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