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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34df5564aed2209c9b3ffe0b80d42dc2bbb9269ad9c4c2f0b81b589681c68e25' 
  AND token = 'kSLpLOspZPf9dPrzt6eiVHB6AMEIJQ9kLLTNgoDsunE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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