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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd32b04454ad866c8e53298d6945abcb31e931f7553ebf0df611d2f5e67b8dd5' 
  AND token = '8b0az+O3x8SPcCQPXi64WrIqI/Ud+P68+awnVVxrSNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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