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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10d5faac9c5b462b39af605b3fe838603950726b45bc7f7f9ea4546410fe504' 
  AND token = '8d00iGvojujww65W+5RNPvJaBs+QtQ4t5r/dGnAr1T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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