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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e45f6eb9697c755e3fd86406cf2e75d92e1cbaed0dd6a5a9d5edcba9a3a799' 
  AND token = 'sAr8h8EPVloX2ASaN+ozIY3I+JgJahm4S5Z3a1uU7UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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