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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102c0f9f3878fd62d5d24ad2ec0dec5e159901fb352a2cfdad3aac4a04cb4b4a' 
  AND token = 'xAlAq0z32CqLxelBa/Gud3XXDFlvXxpFSRQj7SpP5dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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